Use dpkg -i dx80ce820syn213brelpkg (if .deb) or utilize the resilio-inc/connect-scripts to deploy the agent.

Re-download the file from official sources and verify MD5 hashes.

The hardware will cycle down and execute a multi-stage flash routine. Enterprise Deployment: CUCM TFTP Cluster Method

: Verify that the host platform aligns with the ce820 chipset specifications. Mismatched firmware flashes can permanently brick physical controller modules.